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LCE SCIENCE
Human Biology & Health Ch 3 Section 1- 4
| Term | Definition |
|---|---|
| cardiovascular system | the body system that consists of the heart , blood vessels and blood ; also called the circulatory system |
| heart | a hollow, muscular, organ that pumps blood throughout the body |
| atrium | each of the two upper chambers of the heart that receives blood that comes into the heart |
| ventricle | each of the two lower chambers of the heart that pumps blood out of the heart |
| valve | a flap of tissue in the heart or a vein that prevents blood from flowing back |
| pacemaker | a group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates the heart rate |
| artery | a blood vessel that carries blood away from the heart |
| capillary | a tiny blood vessel where substances are exchanged between blood and the body cells |
| vein | a blood vessel that carries blood back to the heart |
| aorta | the largest artery in the body; receives blood from the left ventricle |
| coronary artery | an artery that supplies blood to the heart itself |
| pulse | the alternating expansion and relaxation of an artery wall as blood travels through an artery |
| diffusion | the process by which molecules move from an area of higher concentration to an area of lower concentration |
| blood pressure | the pressure that is exerted by the blood against the walls of the blood vessels |
| plasma | the liquid part of blood |
| red blood cell | a cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere in the body |
| hemoglobin | an iron-containing protein that binds chemically to oxygen molecules; makes up most of the red blood cells |
| white blood cell | a blood cell that fights disease |
| platelet | a cell fragment that plays an important part in forming blood clots |
| lymphatic system | a network of vein like vessels that returns fluid that leaks out of blood vessels to the bloodstream |
| lymph | the fluid that the lymphatic system collects and returns to the bloodstream |
| lymph node | a small knob of tissue in the lymphatic system that filters lymph, trapping bacteria and other microorganisms that cause disease |
| atherosclerosis | a condition in which an artery wall thickens as a result of the buildup of fatty materials |
| heart attack | a condition in which blood flow to part of the heart muscle is blocked, causing heart cells to die |
| hypertension | a disorder in which a person's blood pressure is consistently higher than normal; also called high blood pressure |
Created by:
mrsschaaf
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